pgsql: Simplify useless 0L constants

Simplify useless 0L constants

In ancient times, these belonged to arguments or fields that were
actually of type long, but now they are not anymore, so this "L"
decoration is just confusing.  (Some other 0L and other "L" constants
remain, where they are actually associated with a long type.)

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/0d15afc875f44bcb0adc244c4d9034023f99b609

Modified Files
--------------
src/backend/access/transam/xlogarchive.c | 2 +-
src/backend/backup/backup_manifest.c     | 2 +-
src/backend/commands/copyto.c            | 2 +-
src/backend/commands/createas.c          | 2 +-
src/backend/commands/explain.c           | 2 +-
src/backend/commands/matview.c           | 2 +-
src/backend/commands/portalcmds.c        | 2 +-
src/backend/executor/nodeHashjoin.c      | 4 ++--
src/backend/storage/file/buffile.c       | 6 +++---
src/backend/tcop/pquery.c                | 2 +-
src/backend/utils/sort/tuplestore.c      | 4 ++--
11 files changed, 15 insertions(+), 15 deletions(-)